ML20129G336
| ML20129G336 | |
| Person / Time | |
|---|---|
| Site: | Vermont Yankee File:NorthStar Vermont Yankee icon.png |
| Issue date: | 10/02/1996 |
| From: | Craig Harbuck NRC (Affiliation Not Assigned) |
| To: | Reid D VERMONT YANKEE NUCLEAR POWER CORP. |
| Shared Package | |
| ML20129G340 | List: |
| References | |
| GL-94-03, GL-94-3, TAC-M95207, NUDOCS 9610070166 | |
| Download: ML20129G336 (4) | |
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1 UNITED STATES
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NUCLEAR REGULATORY COMMISSION f
WASHINGTON. D.C. 2056HC01 o,g.....,/
october 2, 1996 f.r. Donald A. Reid ifice President, Operations Vermont Yankee Nuclear Power Corporation Ferry Road Brattleboro, VT 05301
SUBJECT:
SAFETY EVALUATION REGARDING THE VERMONT YANKEE CORE SHROUD REPAIR (TAC NO. M95207)
Dear Mr. Reid:
On July 25, 1994, the Nuclear Regulatory Commission (NRC) issued Generic Letter (GL) 94-03, "Intergranular Stress Corrosion Cracking of Core Shrouds in Boiling Water Reactors," to address the occurrence of core shroud cracking at a number of boiling water reactors (BWRs).
The NRC staff requested in GL 94-i 03 that BWR licensees take a number of actions with respect to their core shrouds.
These actions included inspection, and if necessary, repair of the core shroud.
In April 1995, the NRC staff reviewed the results of core shroud inspections at Vermont Yankee Nuclear Power Station (VYNPS) and concluded that there was adequate structural margin to allow operation for one additional fuel cycle, to the end of cycle 18. By "05000271/LER-1995-004, :on 950329,repair of Inoperable Vital Fire Barrier Penetration Fire Seal Was Incomplete.Caused by Work Control Process Failure.Established [[Topic" contains a listed "[" character as part of the property label and has therefore been classified as invalid. on One Side of Fire Barrier|letter dated April 27, 1995]], the NRC staff required that Vermont Yankee Nuclear Power Corporation (VYNPC) reinspect and, if necessary, repair the VYNPS core shroud before starting up VYNPS from the next refueling outage at the end of cycle 18 in 1996.
Subsequently, VYNPC determined to proceed with a modification of the VYNPS core shroud during the 1996 refueling outage.
By letter dated April 15, 1996, VYNPC submitted its plans to permanently repair the core shroud. Additional information requested
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by the NRC staff was submitted in a letter from VYNPC dateo August 7, 1996.
The NRC staff has completed its review of VYNPC's proposed modification to permanently repair the VYNPS core shroud. The NRC staff's Safety Evaluation of this proposal is enclosed and is based on the information contained in the two VYNPC submittals dated April 15 and August 7, 1996. The proposed repair of the core shroud has been designed as an alternative to the requirements of the ASME Boiler and Pressure Vessel Code pursuant to Title 10, Code of Federal Regulations, Part 50.55a(a)(3)(i). This alternative is acceptable.
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NRC 11E CENTER C8PY V
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9610070166 961002 PDR ADOCK 05000271 P
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Mr. D. Reid October 2, 1996 VYNPC is requested to submit its plans for the next inspection of the VYNPS core shroud and the tie rod assembly components at least 6 months prior to the inspection. This schedule will allow sufficient time for the NRC staff to evaluate the proposed plan and resolve any comments it may have.
i Sincerely,
/S/
C. Craig Harbuck, Acting Senior Project Manager Project Directorate I-1 Division of Reactor Projects - I/II Office of Nuclear Reactor Regulation Docket No. 50-271
Enclosure:
As stated l
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Mr. D. Reid !
f VYNPC is requested to submit its plans for the next inspection of the VYNPS' core shroud and the tie rod assembly components at least 6 months prior to the inspection.
This schedule will allow sufficient time for the NRC staff to l
evaluate the proposed plan and resolve any comments it may have.
Sincerely, 0
o C. Craig Harbuck, Acting Senior Pro.iect Manager Project Directorate I-1 Division of Reactor Projects - I/II Office of Nuclear Reactor Regulation Docket No. 50-271
Enclosure:
As stated l
cc w/ encl: See next page 4
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i D. Reid Vermont-Yankee Nuclear Power Station l
Vermont Yankee Nuclear Power Corporation cc:
Regional Administrator, Region I G. Dana Bisbee, Esq.
U. S. Nuclear Regulatory Commission Deputy Attorney General 475 Allendale Road 33 Capitol Street i
King of Prussia, PA 19406 Concord, NH 03301-6937 R. K. Gad, III Resident Inspector.
Ropes & Gray Vermont Yankee Nuclear Power Station 4
One International Place U.S. Nuclear Regulatory Commission j
l Boston, MA 02110-2624 P.O. 90x 176 i
Vernon, VT 05354 Mr. Richard P. Sedano, Commissioner Vermont Department of Public Service Chief, Safety Unit 120 State Street, 3rd Floor Office of the Attorney General Montpelier, VT 05602 One Ashburton Place, 19th Floor Boston, MA 02108 Public Service Board State of Vermont Mr. David Rodham, Director l
2 120 State Street ATTN: James Muckerheide i
Montpelier, VT 05602 Massachusetts Civil Defense Agency 4
400 Worcester Rd.
i Chairman, Board of Selectmen F.O. Box 1496 i
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Town of Vernon Framingham, MA 01701-0317 P.O. Box 116 Vernon, VT 05354-0116 Mr. Raymond N. McCandless Vermont Division of Occupational Mr. Jay Thayer, Vice President and Radiological Health Vermont Yankee Nuclear Power Administration Building Corporation Montpelier, VT 05602 Ferry Road Brattleboro, VT 05301 Mr. J. J. Duffy Licensing Engineer Mr. Robert J.. Wanczyk, Plant Manager Vermont Yankee Nuclear Power Vermont Yankee Nuclear Power Station Corporation P.O. Box 157, Governor Hunt Road 580 Main Street Vernon, VT 05354 Bolton, MA 01740-1398 Robin Dyle, Technical Chairman BWRVIP Assessment Task Southern Nuclear Operating Company Post Office Box 236 40 Inverness Center Parkway Birmingham, AL 35201 Warren Bilanin, EPRI Task Manager 3412 Hillview Ave.
Palo Alto, Cal 94303
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